Pressure transmitter anti-interference problem

1. Pressure transmitter after working overtime need to maintain stability: most of the transmitter after working overtime will produce 'drift', therefore it is necessary to understand the stability of the transmitter before buying, this work in advance can reduce use will appear in all sorts of trouble in the future.

2. Pressure transmitter of encapsulation. Transducer encapsulation, especially is often easy to overlook its frame, however this will gradually exposed its shortcomings in the later use. Transmitter and the choose and buy must take into account the future working environment in the transmitter, humidity, how to install the transmitter, will have a strong impact or vibration, etc.

3. Choose what kind of excitation voltage. The type of the output signal decided to choose how excitation voltage. Many amplifier transmitter has a built-in voltage adjusting device, so the power supply voltage range is larger. Some quantitative configuration, yi sending device is needs a stable working voltage, therefore, can get a working voltage to decide whether to adopt a regulator of the thermocouple sensor, to comprehensively consider transmitter operating voltage and system cost.

4. Whether you need to have the interchangeability of the transmitter. To determine whether the transmitter can adapt to use multiple systems. Generally speaking, it is very important. Especially for OEM products. Once the product into the hands of customers, the customers to the cost of calibration are considerable. If the product has good compatibility, even change the transducer used, will not affect the effect of the whole system.

5. Other: we identify some of the above parameters need to confirm your process of pressure transmitter

6, pressure transmitter, and other electronic equipment adopt what kind of connection between. Whether to need to take a short connection? If a long connection, whether to need to adopt a connector?

7. Choose how to output signal. Pressure transmitter needs to be how the output of the signal: mV, V, mA and digital output frequency output, depends on many factors, including the distance between transmitter and system controller or display, if there is a 'noise' or other electronic jamming signals. Do you need the amplifier, the position of the amplifier and so on. For many short the distance between the transmitter and controller of OEM devices, using mA output of the transmitter is most economic and effective solution, if you need to output signal amplifier, had better use transducer with built-in amplifier. For long distance transmission or exist strong electronic jamming signal, had better use mA output level or frequency output. If in the environment of the RFI and EMI index is high, besides wanting to notice to choose mA or frequency output, but also take into account the special protection or filters. ( At present because of the various acquisition, now in the market pressure transmitter output signal has a lot of kinds, there are mainly four - 20mA,0- 20mA,0- 10 v, 0 - 5 v, etc. , which are frequently used but is 4 Ma and 0-20 10 v two kinds, in my above for the output signal is only 2 - 20 ma for two wire system, what we call the output for some wire system does not contain grounded or shielded wire, other are three wire system) 。